Margin-setting device for typewriters



M. GRAFF. 4

MARGIN SETTING DEVICE FOR TYPEWRITERS.

7 APPLICATION FILED SEPT. 14, 1920,

1,413,721. PatenteMpr 25, 1922-.

2SHEETS%SHEET 1.

Fig. 7.

M.GRAFF.

MARGIN SETTING DEVICE FOR TYPEWRITE RS. APVLICATION FILED SEPT-14, 1920.

2 SHEETS-SHEET 2- 1,41 3,721.- 7 Y I Patented Apr. 25, 1922.

PATENT OFFICE.

MAXIMILIAN GB/AFF, OF BRANDENBURG, GERMANY.

MARGIN-SETTING DEVICE FOR TYPEWRIT EBS.

Specification of Letters Patent.

Patented Apr. 25 1922.

Application filed September 14, 1920. Serial No. 410,320.

To all whom it may concern:

Be it known that I, MAXi'MILIAN GRAFF, German citizen, residing at Brandenburg, Germany, have invented certain new and useful Improvements in Margin- Setting Devices for Typewriters, of which the following is a specification.

The invention relates to a device on typewriters by means of which the stops arranged behind the platen carriage and operating to determine the Width of the mar gins can be conveniently set by a lateral crank handle. An important feature of the invention consists in a stop member being arranged to be shifted on each of a number of spindles when the latter are turned by their respective handles, a rotating scale being associated with each crank handle and indicating the position of the stops at the front of the machine. a I v In typewriters whose mechanism 1s arranged so as to leave a clear space at the front, in order to provide for visible writing and for a free access to the ink ribbons, the stops for setting the margins are placed behind the platen carriage. This arrangement of the stops, which are adapted to be set by keys or handles, is inconvenient, because the typist has to rise from his seat before he is able to reach the said parts for shift ng the stops. This involves a great loss of time.

In typewriters that have the said stops arranged in front of the platen carriage, the margins can be readily set, but the view of the writing sheet is obscured and the parts located at the front make the ink ribbons difficult of access.

Fig. 2 is a horizontal section of the crank drive on the line A-B of Fig. 1.

Fig. 3 represents the surface of the scalebearing drum rolled out flat.

Figs. 4, 5, 6 and 7 are views of the part of the scale as seen from the front of the machine.

Fig. 8 shows the platen scale and the drum scales as-viewed from the front of the typewrlter.

Fig. 9 represents a top view of the screwspindles with the margin stops.

Fig. 10 is a side vancing Wheel.

At the rear wall of the typewriterl are bearing supports 2 in which screw spindles 3 and 1, Fig. 9, are revolubly mounted. The screw spindles 3 and 4 operate to shift the stops 5 and 6 which that-are guided in a slot 8 in the rear wall of the machine. has an upwardly extending tongue 9 against which the striking surface 11 of the carriage 10 ,strikes as indicated in Fig. 1 so as to stop any further motion of the carriage. Fixed on eachof the screw spindles 3 and i is a sprocket Wheel 12 which meshes with a chain 13 that transmits motion from a sprocket wheel 14: and a handle 15, Fig. 2. The sprocket wheel 14 is fixed upon a shaft 16 whose one end is journalled in the side cheek '17 of the machine and whose other end is journalled in a bearing arm 18. Mounted on one end of the shaft 16 is a toothed wheel 21 that is in mesh with the toothed wheel 19 that is on the shaft of the scale-bearing drum. Fixed on the other end of the shaft 16 is a crank handle 15 which is provided with a protuberance 22 that is pressed by a spring 23 into radial grooves 24 of thearresting ring 25. The movable scale consists of admin 20 provided with divisions and a disk 27 with numerals. The drum 20 is fixed on the shaft 28 whilst the numeral disk 29 turns loosely on the same between the drum and the transmission wheel 29 that revolves with the shaft. The motion of the transmission wheel 29 is transmitted to the numeral disk 27 through an advancing wheel 30. The advancing wheel 30 turns loosely on the shaft 31. The shafts 28 and 31 are both journalled in the arms 18 and 32. The numeral disk is advanced figure by figure in a similar manner to an electricity meter or a Veeder counter by the advancing wheel have extensions 7 view of the drum-ad.

Each of the stops 5 and6 30 being'advanced to the extent of a single tooth at each revolution of the advancing wheel 29 by means of an isolated toot-h 33 thereon (Fig. 10). The arrangement of the rotating scale is such that only one horizontal row on the drum 20 and the numeral disk 27 is visible at a time through the window 35 in the front- 34: of the machine, so that the breadth of the margin as measured by the scale 36 will be indicated in the said window,

The mode of operation is as follows: Assuli'iing that a writing sheet is put onto the platen W -and slipped under the scale 36, and that the margin between the edge of the "paper (which is located at, say, the numeral 5 on the scale) and the writing is to extend up to the division 15 on the scale 36, then the handle 15 is turned until the numeral 10 and 5 divisions appear behind the window 35. By the protuberance or detent 22 on the handle 15 entering into the slots 24 of the arresting ring 25 the particular stop is retained in the position indicated. The right hand platen carriage stop 6 is actuated in the same way. 1

I claim:

1. In a typewriter, a laterally movable platen carriage, a stop at the rear of the carriage for limiting the lateral motion of the same, a'screw spindle for shifting the stop, a rotary scale at the front of the typewriter for indicating the positions of the stop, and a handle at the side of the typewriter for turning the scale and the said spindle.

2. In a typewriter, a laterally movable platen carriage, a stop at the rear of the carriage for limiting the lateral motion thereof, a screw spindle for shifting the stop, a

rotary drum with scale divisions on its'periphery, a rotary disk beside the drum, nu-

merals on the disk, a handle at the side of the typewriter for indicating the positions of the stop, means for transmitting the motion of the handle to the spindle, the drum and the said disk, and a window at the front of the typewriter for disclosing only the portion of the drum that indicates the position of the sto n testimony whereof I affix my signature.

MAXIMILIAN Gears. 

